(x+y)² = x²+2xy+y²(x+y)² -2xy=x²+y²(x+y)² -2*(-10)=29(x+y)² +20=29(x+y)² +20-29=0(x+y)² - 9=0(x+y)² - 3²=0(x+y-3)(x+y+3)=01) x+y-3=0 x=3-y (3-y)y= -10 3y-y²+10=0 y² -3y -10=0 D=(-3)² - 4*(-10)=9+40=49 y₁=(3-7)/2= -2 x₁*(-2)= -10 x₁=5 y₂=(3+7)/2=5 x₂*5= -10 x₂= -22) x+y+3=0 x= -3-y (-3-y)y= -10 -3y-y² +10=0 y² +3y -10=0 D=3² -4*(-10)=9+40=49 y₁=(-3-7)/2= -5 x₁*(-5)= -10 x₁=2 y₂=(-3+7)/2=2 x₂*2= -10 x₂= -5Ответ: (-5; 2); (-2; 5); (2; -5); (5; -2).